In August my friend and I discussed contacting his doctor. He sent an email, but doctor was on vacation. Then something bad happened, so friend and I decided not to meet or write anymore, though we're still keeping an eye on each other from a distance. We'll meet again in December.

He hasn't been doing well. There are four of us in this group, and we're family though not related by blood. I was wondering if one of us can contact his doctor for advice. We can't ask his permission, he might not give it. Is it okay if we ask his doctor what to do and maybe explain the situation and see if she can check up on him? There's a possibility that the problem will get worse the longer we delay.

You can contact your friends doctor if you want to but whatever country you're in they won't be able to discuss your friends treatment with you or any details of their condition. If you haven't seen or met this friend for a while how do you know they're not doing well?

I agree with Theresa, you need to concentrate on your own treatment and well being.